[ARC5] BC-AS-230 Transmitter Follies, Part 1

[Mike Hanz]

Precisely.  As Robert Downs mentioned on 12/22, it's why you use a 
phantom antenna instead of a dummy load to tune up these sets.  Xc of 
the A-55 dummy load at 7MHz=-j223 ohms.  If Xl of the "proposed" .11uH 
inductor is +j5 ohms, then obviously the cap swamps the inductor even at 
ten times that inductance.  But if you think of it from the systems 
perspective, the transmitter tank is designed to feed that kind of load, 
so it's a no-brainer from the start...

Happy New Year, everyone,
Mike  KC4TOS

On 12/31/2014 3:37 PM, AKLDGUY . wrote:
> I'll probably use a 5 ohm 10W wire-wound, with one section of a BCB
> tuning capacitor connected in series. When the resistor's inductive
> reactance is tuned out by the capacitor, the effect should be obvious.
>
> 73 de Neil ZL1ANM
>
>
> On Thu, Jan 1, 2015 at 8:40 AM, Dennis Monticelli <
> dennis.monticelli at gmail.com> wrote:
>
>> Ben,
>>
>> Glad to hear that the rig seems to be working.
>>
>> I would like to comment on that 5 ohm wire-wound resistor.  I would be
>> suspicious of it because the effective series inductance (ESL) would likely
>> be a significant percentage of the 5 ohm stamped resistor value.  For
>> example, it only takes 0.11 uH to equal 5 ohms of inductive reactance at
>> 7MHz.  It's the low value wire-wound resistors that you have to watch out
>> for.
>>
>> Dennis AE6C